A Pilot-Scale Comparison of IFAS and MBBR to Achieve Very Low Total Nitrogen Concentrations
Abstract:In northern Europe, the Moving Bed Biofilm Reactor (MBBR) process, which uses equipment almost identical to that used for the Integrated Fixed-film Activated Sludge (IFAS) process but has only an attached-growth biomass, has proven to be a good nutrient removal choice for facilities that treat low-strength waste and operate at low temperatures. Pilot testing of both processes was carried out at the Mamaroneck wastewater treatment plant in Westchester County, New York, where conditions are similar to those encountered in northern Europe. The program was intended to test the ability of both MBBR and IFAS to meet a future total nitrogen effluent limit of approximately 4 mg/L. The loading to the pilot unit was pushed to its maximum during the lowest winter temperature, enabling the two processes to be assessed under maximum stress conditions. Results from the pilot testing confirmed that either process would be capable of achieving the target total nitrogen concentration.
Document Type: Research Article
Publication date: 2007-11-01
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